Coal burning boiler

Abstract

The invention discloses a coal burning boiler. The coal burning boiler comprises a chain grate which penetrates through a hearth, is used for conveying coal and is used as a fire bed and a coal supply device. The hearth comprises a front arch, a back arch, a water cooling wall and a channel thereof. The coal burning boiler further comprises a coal-water slurry burner and a coal-water slurry conveyer system which provides the coal-water slurry burner with fuel, wherein, the coal-water slurry burner is arranged at the middle part between the front arch and the back arch and the chain grate is used as an igniting device. The invention provides a coal burning boiler which combines coal-water slurry with fire coal; the fuel consumed for unit heat production is low; the range of the burned coal is wide; and the coal burning boiler improves the boiler steam rate.

Description

(1) Technical field [0001] The invention relates to a coal-fired boiler, in particular to a coal-fired boiler with a chain grate. (2) Background technology [0002] Chain boilers in coal-fired boilers are thermal equipment commonly used by small and medium-sized enterprises. They have a history of more than 100 years. Although they have undergone many large-scale technological innovations, their thermal efficiency is still lower than 60%, and the actual output can only reach 60%. %~70%. Because the chain boiler has a strong selectivity to the coal it burns, that is to say, when designing, the first thing to determine is the type of coal or other fuels to be used, and then design the shape and size of the arch according to the type of coal used. After installation, the shape and size of the arch designed according to the type of coal burned cannot be changed, causing it to only burn the type of coal designed or similar to the type of coal, so the adaptability to the type of ...

AI Technical Summary

Problems solved by technology

Among them, although the combustible components of the coal-water slurry boiler burn relatively fully, the flame temperature is relatively high, so that the ash produced by the combustion of the combustion material is in a molten or semi-melted state and adheres to the ash bucket, which is difficult to clean.

In addition, its storage and transportation are much more troublesome than raw coal due to its fluid state

Moreover, the current coal-water slurry boilers require additional ignition equipment, such as diesel burners, plus its storage tanks, transportation and other auxiliary equipment. On the other hand, coal-water slurry boilers often have fire extinguishing problems due to uneven injection or low furnace temperature, and the diesel burner has to be started repeatedly to ignite

On the other hand, since coal water slurry is an in-depth treatment of coal, its cost per unit of heat must be much more expensive than raw coal, which is why many manufacturers are reluctant to use coal water slurry boilers

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